A PCB layout method for high-frequency control circuits for welding machines

Abstract

The present invention discloses a PCB layout method for a high-frequency control circuit for a welding machine, wherein the high-frequency control circuit includes a high-voltage circuit, a gun switch control circuit, an input control part, and a power supply circuit. The PCB is a square structure, and the first to fourth sides are respectively arranged counterclockwise, and the area close to the first side is the first area, which is used to set the high-voltage circuit, and the area close to the third side is the second area, which is used to set the power supply circuit. The boundary between the first area and the second area and the area composed of part of the second side and part of the fourth side are divided into the third area and the fourth area, and the third area close to the second side is used to set the gun switch control circuit, and the fourth area close to the fourth side is used to set the input control part. The present application improves the anti-high-frequency interference capability of the circuit board and improves the product reliability by setting the high-voltage and high-frequency of the high-frequency control circuit and the control circuit in different areas.

Description

Technical Field

[0001] The invention relates to the technical field of welding machine control, and in particular to a PCB board layout method for a high-frequency control circuit for a welding machine. Background Art

[0002] At present, the welding machine control circuit includes a high-voltage part, a high-frequency part and a low-voltage control part. When designing the welding machine control circuit PCB board, if a reasonable layout cannot be performed, the high-voltage part will first interfere with the low-voltage control part, and the high-frequency signal will interfere with the low-frequency signal, thereby affecting the welding effect.

[0003] Therefore, the reasonable layout and welding of the PCB board for high-frequency control circuits is an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to provide a PCB layout method for a high-frequency control circuit for a welding machine, which distributes different circuits of a high-voltage high-frequency circuit and a low-voltage control circuit in a modular manner, thereby improving the circuit board's ability to resist high-frequency interference.

[0005] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0006] A method for PCB layout of a high-frequency control circuit for a welding machine. The high-frequency control circuit includes a high-voltage circuit, a gun switch control circuit, an input control part, and a power supply circuit. The PCB is a square structure, and the first to fourth sides are respectively arranged counterclockwise. The area close to the first side is the first area, which is used to set the high-voltage circuit. The area close to the third side is the second area, which is used to set the power supply circuit. The boundary between the first area and the second area and the area consisting of part of the second side and part of the fourth side are divided into the third area and the fourth area. The third area close to the second side is used to set the gun switch control circuit, and the fourth area close to the fourth side is used to set the input control part.

[0007] The present invention is further configured as follows: the high-voltage circuit includes a high-voltage transformer, a discharge nozzle, and a high-frequency control circuit; the first area is divided into three sub-areas for respectively arranging the high-voltage transformer, the discharge nozzle, and the high-frequency control circuit.

[0008] The present invention is further configured as follows: the high-voltage transformer is arranged at a position in the first area close to the fourth side, that is, at a position in a first sub-area surrounded by the first side and the fourth side.

[0009] The present invention is further configured as follows: the discharge nozzle and the output filter capacitor are arranged on one side of the high voltage transformer along the first side, that is, at the position of the first and second sub-areas surrounded by the first side and the second side.

[0010] The present invention is further configured as follows: the high-frequency control circuit is arranged on one side of the high-voltage transformer and the rectifier circuit, away from the area of ​​the first side.

[0011] The present invention is further configured as follows: the gun switch control circuit part includes a gun switch control circuit, and the gun switch control circuit includes three common mode inductors, which are distributed near the second side and arranged in a finished product shape.

[0012] The present invention is further configured as follows: the gun switch control circuit part also includes an isolation circuit, and the isolation circuit is distributed on one side of the three common mode inductors away from the second side.

[0013] The present invention is further configured as follows: the gun switch control circuit part also includes a signal input terminal, which is arranged along the second side and close to the common mode inductor.

[0014] The present invention is further configured as follows: a power supply circuit is arranged in a second area formed by a third side and a fourth side, and is used to provide power for the high-frequency control circuit.

[0015] The present invention is further configured as follows: the input control part is located in a fourth area formed by the power supply circuit, the isolation circuit, the high-frequency control circuit, and the fourth side.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are:

[0017] 1. This application improves the circuit board's ability to resist high-frequency interference by arranging the high-voltage and high-frequency control circuit and the control circuit in different areas;

[0018] 2. Furthermore, the partition layout of the present application can realize the modularization of the PCB board layout and improve product reliability;

[0019] 3. Furthermore, the present application provides an input terminal interface at the edge of the PCB board to facilitate connection with external control, save assembly time of the circuit board, and facilitate subsequent product maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the regional distribution structure of a PCB board according to a specific embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of a high-frequency control circuit of a specific embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the distribution structure of a high-frequency control circuit PCB board of a specific embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings. Specific embodiment 1

[0025] A high-frequency control circuit for a welding machine of the present application comprises a high-voltage circuit, a gun switch control circuit, an input control circuit and a power supply circuit.

[0026] The PCB layout method of the high-frequency control circuit for welding machine of this embodiment is as follows: Figure 1 As shown, the PCB board is a square structure, with the first side of one side, and the second to fourth sides in the counterclockwise direction. The area composed of the first side, part of the second side, and part of the fourth side is the first area, which is used to set the high-voltage circuit; the area composed of the third side and part of the fourth side is the second area, which is used to set the power circuit; part of the second side, part of the third side, and the edge of the first area form the third area, where the gun switch control circuit is set; part of the fourth side, the edge of the first area, the edge of the second area, and the edge of the third area form the fourth area, where the input control circuit is set.

[0027] High-voltage circuit section The high-voltage circuit section includes a high-voltage transformer, a discharge nozzle, and a high-frequency control circuit. Accordingly, the first area is divided into three sub-areas, which are used to set the high-voltage transformer, the discharge nozzle, and the high-frequency control circuit respectively.

[0028] The high-voltage transformer is disposed close to the fourth side and the first side at the same time, and this is a first sub-area surrounded by the first side and the fourth side.

[0029] The discharge nozzle is arranged close to the high voltage transformer and the second side, which is the first second sub-area surrounded by the first side and the second side.

[0030] An output filter capacitor is arranged near one side of the discharge nozzle and part of the second side to filter and isolate the output.

[0031] The high-frequency control circuit is far away from the first side, and is arranged at the edge of the first sub-region and the first second sub-region, close to the middle position of the PCB board.

[0032] The gun switch control circuit includes three common mode inductors, an isolation circuit, and a signal input terminal.

[0033] The signal input terminal is arranged along the second side and is close to the output filter capacitor.

[0034] The two common-mode inductors are arranged close to the signal input terminal in sequence, and the filter capacitor and the third common-mode inductor are arranged on the other side of the two common-mode inductors. The three common-mode inductors are arranged in a finished product shape.

[0035] The three common mode inductors are distributed near the second side of the part and arranged in a finished shape, close to the output filter capacitor.

[0036] The isolation circuit is arranged between the third area and the fourth area and is used for isolating different power supplies. Specific embodiment 2

[0038] A high-frequency control circuit for a welding machine of the present application, such as Figure 2 As shown, the high-voltage part circuit includes a high-voltage transformer T1, a rectifier circuit, and a high-frequency control circuit. The high-voltage transformer T1 includes a primary coil and a secondary coil. One end of the primary coil is connected to the R1 / C1 parallel combination and then connected to the first circuit input end, and the other end is connected to the first rectifier input end of the rectifier circuit. The second rectifier input end of the rectifier circuit is connected to the second circuit input end. The first and second circuit input ends are connected to two terminals of the CN2 terminal.

[0039] One end of the secondary coil of the high-voltage transformer T1 is connected to resistors R2 / R17 in sequence, and then connected to one end of the discharge nozzle FDQ and a power output terminal XS1; the other end of the secondary coil is connected to the other end of the discharge nozzle FDQ, and then connected to another power output terminal XS2 through a parallel combination of capacitors C3 / C4 / C17.

[0040] The output of the rectifier circuit is connected to a high-frequency control circuit, which includes a first isolation circuit U7 and a power tube Q2.

[0041] The control input terminal is connected to the fourth terminal of the wiring terminal CN1, one end of the resistor R3, and one end of the resistor R4. The other end of the resistor R4 is connected to the base control terminal of the transistor Q1. The emitter output terminal of the transistor Q1 is connected to the 24V power supply ground. The collector input terminal of the transistor Q1 is the isolated first output terminal of the first isolation circuit U7. The isolated first input terminal is connected to the 24V DC power supply through the resistor R5; the isolated second input terminal is connected to the 15V DC power supply V1 through the resistor R11, and the isolated second output terminal is connected to the control electrode of the power tube Q2. The voltage regulator ZD1, the capacitor C1, and the resistor R18 are connected in parallel between the control electrode and the output electrode of the power tube Q2. The drain input electrode of the power tube Q2 is connected to a rectifier output terminal of the rectifier circuit and one end of the parallel combination of R10 / C8; the output electrode of the power tube Q2 is connected to another rectifier output terminal of the rectifier circuit and the other end of the parallel combination of R10 / C8.

[0042] The gun switch control circuit includes three common mode inductors LF1 / LF2 / LF3, the signal input end includes the CN1 terminal, the 4th terminal inputs the input signal of the control high-frequency circuit, the 5th terminal outputs the first control signal; the 7th terminal is connected to the second control signal, and the first and second control signals are used for external remote control.

[0043] The input control circuit includes an input terminal CN3, the seventh terminal of the input terminal CN3 is connected to the first end of the common mode inductor LF1, and the second end thereof is connected to one end of the capacitor CY1, the first end of the common mode inductor LF2, and one end of the capacitor CY6. The first end and the second end of the common mode inductor LF1 are two ends of the same coil, and the first end and the second end of the common mode inductor LF2 are two ends of the same coil; the other end of the capacitor CY1 is connected to the common ground. The second end of the common mode inductor LF2 is connected to the negative end of the diode D5 and DM, and the positive end of the diode D5 is connected to the 15V DC power supply V1 through the resistor R6.

[0044] The fifth terminal of the input terminal CN3 is connected to the third end of the common mode inductor LF1, and the fourth end thereof is connected to one end of the capacitor CY2, the third end of the common mode inductor LF2, and the other end of the capacitor CY6. The third and fourth ends of the common mode inductor LF1 are two ends of the same coil, and the third and fourth ends of the common mode inductor LF2 are two ends of the same coil; the other end of the capacitor CY2 is connected to the common ground. The fourth end of the common mode inductor LF2 is connected to the negative end of the diode D6, one end of the capacitor C5, and one end of the resistor R7. The positive end of the diode D6 and the other end of the capacitor C5 are connected to the ground of the 15V DC power supply. The other end of the resistor R7 is connected to the first input end of the second isolation circuit U5, and the first output end of the second isolation circuit U5 is connected to the ground of the 15V DC power supply. The second input end of U5 is connected to the seventh end of the CN1 connection terminal, and the second output end of U5 is connected to the ground of the 24V DC power supply.

[0045] The first terminal of the input terminal CN3 is connected to the third end of the common mode inductor LF3 and one end of the capacitor CY4. The fourth end of the common mode inductor LF3 is connected to the 15V DC power supply ground. The other end of the capacitor CY4 is connected to the common ground.

[0046] The third terminal of the input terminal CN3 is connected to the first end of the inductor LF4 and one end of the capacitor CY3. The second end of the inductor LF4 is connected to the cathode of the diode D3. The anode of the diode D3 is connected to a 15V DC power supply through a resistor R8. The other end of the capacitor CY3 is connected to the common ground.

[0047] The second terminal of the input terminal CN3 is connected to the first end of the common-mode inductor LF3 and one end of the capacitor CY5. The second end of the common-mode inductor LF3 is connected to one end of the resistors R9 and R19. The other end of the resistor R19 is connected to a 15V DC power supply. The other end of the resistor R9 is connected to one end of the capacitor C8 and the positive input end of the amplifier circuit U4. The negative input end of the amplifier circuit U4 is connected to one end of the resistor R12, one end of the capacitor C9, and the fourth input end of the third isolation circuit U2. The other end of the capacitor C9 is connected to the second input end of the third isolation circuit U2 through the resistor R13. The first input end of the third isolation circuit U2 is connected to the 15V power supply. Ground, its third terminal is connected to a 15V power supply, the 1st and 2nd input terminals form an optical coupling input control terminal, and the 3rd and 4th input terminals form an optical coupling input control terminal; the 5th and 6th terminals of the third isolation circuit U2 are optical coupling output terminals, the 5th terminal is connected to one end of a resistor R14 and the positive input terminal of the follower circuit U3, the other end of the resistor R14 is connected to the 24V power supply ground, the negative input terminal and the output terminal of the follower circuit U3 are simultaneously connected to one end of a resistor R15, and the 6th terminal is connected to a 15V DC power supply; the other end of the resistor R15 is connected to the 5th end of the terminal CN2 and one end of a resistor R16, and the other end of the resistor R16 is connected to the 24V power supply ground.

[0048] The other end of resistor R12 is connected to the 15V DC power supply ground, and the other end of capacitor CY5 is connected to the common ground.

[0049] The power supply circuit includes a three-terminal voltage regulator circuit U1, a power isolation circuit U6 and peripheral filter capacitors C19 / C12 / C11 / C13 / C15, among which capacitors C12 and C13 are electrolytic capacitors.

[0050] Based on the high-frequency control circuit for welding machine of this embodiment, the layout of the component surface of the PCB board is as follows: Figure 3 As shown, specifically, the bottom edge is the first edge, and the second, third, and fourth edges are marked in the counterclockwise direction.

[0051] A high-voltage transformer is arranged near the corner of the first side and the fourth side, the discharge nozzle FDQ is arranged between the second side and the high-voltage transformer, and two output terminals XS1 / XS2 are arranged at two sides of the discharge nozzle FDQ respectively.

[0052] Near the high-voltage transformer and the fourth side, along the transformer direction, R1, C2, terminal CN2, and four rectifier diodes of the rectifier circuit are arranged in sequence. The four rectifier diodes are arranged in a quadrilateral. On the side of the rectifier diode quadrilateral away from the high-voltage transformer, the power tube Q2 of the high-frequency control circuit is arranged. Between the power tube Q2 and the rectifier diode quadrilateral, R10 / C6 are arranged in parallel. On the side of the power tube Q2 away from the rectifier diode, the voltage regulator tube ZD1 is arranged.

[0053] At the corner between the discharge nozzle FDQ and the second side, output filter capacitors C3 / C4 / C17 are arranged in sequence, and the output filter capacitors C3 / C4 / C17 are aligned with the output terminal XS2.

[0054] On the side of the output filter capacitor C3 / C4 / C17 away from the discharge nozzle FDQ, the terminal CN3, the common mode inductors LF1 and LF2 are arranged in sequence, and the terminal CN3 is placed along the second side.

[0055] On the side of the common-mode inductors LF1 and LF2 close to the third side, capacitors CY4 / CY5 / CY3 / CY2 / CY1 and common-mode inductor LF3 are arranged in sequence along the second side into the PCB board.

[0056] An isolation circuit is provided on a side of the common mode inductors LF3 and LF2 away from the second side.

[0057] An isolation power supply U6 is arranged between the isolation circuit and the third side, and isolation circuits U2 / U5 / U7 are arranged in sequence starting from the isolation power supply U6.

[0058] An input terminal CN1 is provided on the fourth side corresponding to the position of the isolation circuit U2 / U5 / U7. A three-terminal voltage regulator circuit U1 is provided between the input terminal CN1 and the isolation circuit U2. The remaining resistors and capacitors are respectively distributed on the two sides of the isolation circuit U2 / U5 / U7.

[0059] The electrolytic capacitors C12 and C13 are arranged on both sides of the isolated power supply U6 along the third side.

[0060] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for PCB layout of a high-frequency control circuit for a welding machine, characterized in that: The high-frequency control circuit includes a high-voltage circuit, a gun switch control circuit, an input control part, and a power circuit. The PCB board is a square structure, and the first to fourth sides are respectively arranged counterclockwise. The area close to the first side is the first area, which is used to set the high-voltage circuit. The area close to the third side is the second area, which is used to set the power circuit. The boundary between the first area and the second area and the area consisting of part of the second side and part of the fourth side are divided into the third area and the fourth area. The third area close to the second side is used to set the gun switch control circuit, and the fourth area close to the fourth side is used to set the input control part. The power supply circuit includes a three-terminal voltage stabilizing circuit U1, a power supply isolation circuit U6, and capacitors C19, C12, C11, C13 and C15 for filtering; The high-voltage circuit includes a high-voltage transformer, a discharge nozzle, and a high-frequency control circuit. The first area is divided into three sub-areas for arranging the high-voltage transformer, the discharge nozzle, and the high-frequency control circuit respectively; the high-frequency control circuit includes a first isolation circuit U7; Among them, the gun switch control circuit part includes a gun switch control circuit, which includes three common mode inductors distributed near the second side and arranged in a finished product shape; the gun switch control circuit part also includes an isolation circuit, which is distributed on the side of the three common mode inductors away from the second side.

2. The method for PCB layout of a high-frequency control circuit for a welding machine according to claim 1, characterized in that: The high-voltage transformer is arranged in a position of the first area close to the fourth side, that is, in a first sub-area surrounded by the first side and the fourth side.

3. The method for PCB layout of a high-frequency control circuit for a welding machine according to claim 1, characterized in that: The discharge nozzle and the output filter capacitor are arranged on one side of the high voltage transformer along the first side, that is, at the position of the first and second sub-areas surrounded by the first side and the second side.

4. The method for PCB layout of a high-frequency control circuit for a welding machine according to claim 2, characterized in that: The high-frequency control circuit is arranged on one side of the high-voltage transformer and the rectifier circuit, away from the area of ​​the first side.

5. The method for PCB layout of a high-frequency control circuit for a welding machine according to claim 1, characterized in that: The gun switch control circuit part also includes a signal input terminal, which is arranged along the second side and close to the common mode inductor.

6. The method for PCB layout of a high-frequency control circuit for a welding machine according to claim 1, characterized in that: The power circuit is arranged in the second area formed by the third side and the fourth side, and is used to provide power for the high-frequency control circuit.

7. The method for PCB layout of a high-frequency control circuit for a welding machine according to claim 6, characterized in that: The input control part is located in the fourth area composed of the power supply circuit, the isolation circuit, the high-frequency control circuit, and the fourth side.

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